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A copy of the jQuery UI library was bundled with the module in the D6 version to avoid having a dependency on the jQuery UI module.

In Drupal 7, jQuery UI is part of the core though, which means that this bundled copy is unneeded, adds to the module download size, and makes it hard for module that want to override jQuery UI globally, such as jQuery Update.

I'm going to attach a patch to remove the bundled copy and use the core one through drupal_add_library.